Melody

921 Questions
34316 Answers

+1

1

1742

2

+118730

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 2022

-8

610

1

+118730

Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. lire plus ..

Melody 16 mars 2022

-2

8

1481

5

+118730

How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside lire plus ..

●●●●●

Melody 15 mars 2022

-3

873

3

+118730

HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

Hors sujet

Melody 13 mars 2022

-4

850

3

+118730

WELCOME BACK CPHILL !

Melody 11 févr. 2022

-5

719

2

+118730

Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. lire plus ..

Melody 1 févr. 2022

-7

888

11

+118730

Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do lire plus ..

●●●●●●●●●●●

Melody 9 janv. 2022

-6

1

997

3

+118730

HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 2021

+5

16

5574

9

+118730

Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer lire plus ..

Hors sujet

●●●●●●●●●

Melody 4 nov. 2021

-9

1093

1

+118730

Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

Hors sujet

Melody 29 oct. 2021

+118730

0

2 equations will solve for 2 unknows.
You have 4 unknowns
You cannot solve it.

Is there more to your question that you have not posted?

Melody19 nov. 2013

+118730

0

The reciprocal index (change the index to an improper fraction first.)

Melody19 nov. 2013

+118730

0

When do u switch places on a number when ur calculating with roots. for example. √(1-√2)². and then it becomes √2-1. WHYYYY???

When a sqrt is written into a question, only the positive root is required. 1-sqrt2 is negative so that is not the correct root. The correct one would be -(1-sqrt2) = -1+sqrt2 = sqrt2-1

eg
sqrt[ (-2) ² ] = sqrt (4) = 2

Melody19 nov. 2013

+118730

0

How does this work (sqrt(2)-sqrt(8))^2 ?? plz expalain. why doesnt it become -6 or 6 and why is the answear 3??? ty for the answear in before hand

sqr8 = sqrt(4*2) = sqrt4 * sqrt2 = 2sqrt2

sqrt2 - 2sqrt2 = -sqrt2

(-sqrt2) ² = (-sqrt2)*(-sqrt2) = +2

Melody19 nov. 2013

+118730

0

Do you want more help for this question?
I actually did post a detailed answer but I think it came in at exactly the same time as the other reply and mine vanished.
I was a bit annoyed and I just posted the final answer.
If you need me to help more I can.
Let me see what you have done first though.

Melody19 nov. 2013

+118730

0

ok, Have fun, lol

Melody19 nov. 2013

+118730

0

how much would you have in the bank if you invested £2000 at an interest rate of 4% p.a, for three years?

If it is compounded yearly it will be

2000*1.04 ³ pounds

If it is compounded more often it will be a bit more.

Melody18 nov. 2013

+118730

0

Melody18 nov. 2013

+118730

0

Do you know hae many fluid ounces in a quart? I don't, we stop using imperial units in Australia in 1974.
I could google it an find out, but you could do that yourself.

Melody18 nov. 2013

+118730

0

log is base 10
ln is base e
Your calculator doesn't use any other bases.
You may need to use change of base law
Wikipeadia has a nice list of log laws that i still often refer to.

Melody18 nov. 2013